Abstract: The present invention relates to a straight edge clamp that has a clamping head assembly and a stop assembly mounted upon the body of the straight edge. The head and stop are not connected together and the stop assembly is free to move with respect to the head assembly. The straight edge clamp body includes at least two sections that are hinged together to allow the sections to be folded upon one another when not in use and unfolded when in use.

Abstract: Disclosed are a system, device and method for flagging documents, wherein a Flagging Device (FD) retains one or more page flags and affixes them to the edges of a document's pages, and a Flagging Ruler (FR) detachably accepts the Flagging Device (FD) while allowing for it to travel and be positioned along its length, while accepting and holding one or more pages, to be flagged, relative to the Flagging Device FD.

Abstract: An ice skate blade edge measurement device includes a measurement device frame and a measurement indicator. The measurement device frame defines at least one storage location for the measurement indicator such that, when not being used to measure an alignment of a pair of sharpened skate blade edges, the measurement indicator can be stored. One storage location can be on a front side of the measurement device frame away from a measurement location and another storage location can be on a back side of the measurement device frame.

Abstract: A quick clamp is adapted for a worktable, and includes a slide bar for clamping or loosening a workpiece by the sliding thereof, and a fixing rod fixedly connected to the worktable. The quick clamping device further includes a pushing mechanism for pushing the slide bar towards the worktable, and a locking mechanism for locking the slide bar at a position. At least some advantages of the present quick clamp include simplicity in structure and cost-effectiveness, and the assurance of a quick clamping and quick release functionality. The present quick clamp also provides simple operation and reliable clamping, while improving convenience and comfort of operation.

Abstract: Stand assembly includes base and first and second stand units. The first stand unit includes first body and extending portion. The first body has first and second ends and first shaft. The extending portion connects the first body and has first shaft hole having first hole portion and second hole portion communicated with each other. The first shaft is pivotally connected to the base. The second stand unit includes second body having third end and second shaft. The second shaft is pivotally connected to the first or second hole portion, selectively. When the second shaft is pivotally connected to the first hole portion, the third end abuts against the second end. When the second shaft is pivotally connected to the second hole portion, the third end leaves the second end, so the second stand unit can rotating relative to the first stand unit.

Abstract: A portable drawing board device adapted for helping art students to draw perspective drawings, includes: (a) a generally rectangular-shaped, flat drawing surface on an upper surface of the drawing board, the drawing surface being adapted for supporting a flat drawing substrate; (b) a pair of parallel side grooves in an upper surface of the drawing board, each being parallel and adjacent to one of two opposite sides of the drawing surface, and extending the length of the drawing surface; (c) a pair of first slide adjusters adapted for sliding up and down along the side grooves; and (d) a pair of movable pivot arms, each movably attached at one end to a slide adjuster; wherein, when the first slide adjuster is in the side groove, the pivot arm extends over a portion of the drawing surface, and is adapted for assisting a user in drawing horizontal and diagonal lines on the drawing substrate.

Abstract: A hand drawing machine which is used to copy a planar image by hand onto a piece of paper or other suitable flat material. A tracking means for correlating movement of both styluses in the horizontal direction and a guiding means for correlating movement of both styluses in the vertical direction are utilized in both embodiments. The hand drawing machine of either embodiment of the present invention utilizes a framework for holding the hand drawing machine steady relative to a flat surface enabling a user to place the hand drawing machine on any suitable flat surface such as a drafting table. The tracking means is slidably attached to the guiding means forming an assembly. The assembly is firmly attached to the framework by an attachment means. The tracing stylus holder is in mechanical communication with the marking stylus holder, through the assembly, such that any movement of the tracing stylus holder reproduces a corresponding movement in the marking stylus holder.

Abstract: A drywall marking and scoring guide tool having a generally T shape that includes a U-shaped top channel to slidably engage the edge of a drywall sheet, the top channel having a perpendicular stem extending from the channel and incorporating a plurality of guide apertures incrementally spaced along the stem's length. The guide apertures to receive a marking or scoring device so as the guide is drawn down the length of a drywall sheet the surface of the sheet is scored or marked.

Abstract: Apparatus for securing flat articles to be cut, includes, in one embodiment, a base and a clamp bar coupled to the base by actuators. The actuators are slideably moveable to actuate the clamp bar between a clamping position near the base and an open position away from the base. A flat article is positioned between the clamp bar and the base, and the actuators are moved to position the clamp bar into the clamping position, securing the flat article to the base in a desired position for cutting. In an alternate embodiment, an apparatus includes a biasing member operatively engaged with the clamp bar to urge the clamp bar away from or toward the base. In another alternate embodiment, an apparatus includes a swing arm slideably coupled with the clamp bar, the swing arm having a straight edge.

Abstract: A drawing board and clipscale combination in which a paper holder and a ruler are united in a single body. The board has a groove and a portion overhanging it along each of the four sides. The clipscale includes a ruler, one side of which is protruded in the middle with a screw hole for receiving a screw. The other side of the ruler is a base side, and on the back is a linear hook-shaped stopper. The stopper is received in the groove of the board, and paper is positioned while the screw is loose. As the screw is threaded deeper, the one side of the clipscale is raised off the board, with the hook of the stopper engaged complementarily with the portion overhanging the groove of the board, so as to serve as a fulcrum. The base side is forced against the board with paper therebetween, so that the paper and the clipscale are fixed on the board in one action.

Abstract: A drawing board and drawing instrument combination is provided. The drawing board has grooves along three of its edges and at 45.degree. across the corners which can receive tongues provided on either side of a flat drawing instrument. The instrument has a number of straight edges which overlie the board in use and which make different angles to the edge of the board. The instrument serves as a T-square and also as a set-square, and is reversible.

Abstract: In a preferred embodiment, there is provided a combination of a windowed indexed calibrated T-square and a precision-lined drafting board for use therewith for providing scaled drawings on drafting paper transparent to the drafting board's precision lines, the window being positioned in the helve head such that the index line positioned along a lower edge of the window is alignable with and positioned over the drafting board's precision lines when flat roller surfaces of spaced-apart x-axis aligning rollers on the helve head are pressed flushly against upright flat linearly-extending edge of the drafting board with the edge extending along the x-axis of the drafting board, with the roller surfaces being of broad width affording non-wobbling stable positioning of the blade of the T-square relative to an upper face of the drafting board when the T-square has the roller surfaces pressed flushly against the flat surfaces of the upright flat linearly-extending edge of the drafting board.

Abstract: A multi-functional tool arranged to allow rapid marking of perpendicular and angular lines on material surfaces is disclosed. One or more extendable stops are provided in the body of the tool to rapidly fix the angular orientation of a marking edge. Optionally, associated measuring devices such as a level, tape measure, and plumb bob, may be included to facilitate the location and orientation of the position to be marked.

Abstract: A guide clamp is disclosed which includes a clamping jaw at one end of a guide bar. An opposing shifting jaw is slidably carried on the guide bar to permit a workpiece to be embraced by the jaws. The guide bar is a flat, rectangular channel member open at the undersurface which engages the workpiece surface. The jaws, extended below this undersurface engage the opposite sides of the workpiece, such as a board, with the shifting jaw being shiftable and lockable in the channel at a jaw-engaging position and with the clamp jaw being shiftable in the channel a short distance by lever action to lock the clamp onto the workpiece. When so mounted and locked upon a workpiece, the guide clamp may be used as a clamp, a marker guide or a tool guide. Suitable guideways to guide and hold tools, jegs and the like may be provided on the guide bar.

Abstract: A drafting table and measurement system which utilizes a read head for measuring the displacement of a straight edge overlying the drafting table. The drafting table mounts two perpendicularly disposed straight edges, one of which moves to and fro along the X-axis of the drafting table and the other which moves in a to-and-fro movement along the Y-axis of the table. Each straight edge is mounted on a carrier block via an adjustable member which can be operated to draw a portion of the straight edge toward the carrier block to clamp the straight edge to the table and inhibit the to-and-fro movement. A read head is mounted on each carrier block in justaposition with a scale that slidably receives the carrier block. The read head cooperates with the scale to provide a signal representative of the displacement of the straight edge.

Abstract: A line guide holder for support on and selective positioning along a surface to provide marking of a line of written material mounted on a copy holder. The holder is slidably mounted in a groove along one side of the copy holder.

Abstract: A drawing instrument and locking apparatus therefor in which the locking apparatus can be made of polyethylene, polypropylene or the like and is not subject to fragmentation or permanent damage during normal use. A displaceable member of the locking apparatus is displaceable into a groove of a drawing board to lock the drawing instrument in position thereon. An outer ring member freely rotatable through 360 degrees around the displaceable member when the displaceable member is in its raised condition engages the displaceable member when the displaceable member is in its depressed condition upon rotation of the ring member to unlock the apparatus.

Abstract: A drafting apparatus for use with a drawing board having a side edge portion and a planar drawing surface in which a guide track extends in spaced relation to the side edge of the board and is mounted from the board for adjustment into several different positions in relation to the board. A T-square having a head body member provided with wheels for rolling engagement with the guide track and carrying a strip of material serving as an armature for coaction with a pair of spaced magnets carried by the head member of the T-square. The magnets are carried on a bar member provided with pivotal movement about a longitudinal horizontal pivot axis parallel to the side edge of the board, the magnet carrying bar member having an actuator portion for releasing the magnets from the armature strip. A slidable lock element is carried by the actuator portion to lock the magnet carrying bar member in release position if desired.

Abstract: A panel grooving apparatus has a table for supporting a panel at a working level. A rail extends along a side of the table and a working assembly is mobile on that rail. The working assembly is selectively immobilized in various grooving positions by stops movable and selectively arrestable along the rail and engageable by part of said working assembly. The panel is releasably retained on the table by movable peripheral elements thereon. In a simplified embodiment, the working table may be reduced to a ruler on which a shoe of a rectilinear guide slides.

Abstract: An improved copy holder comprises a stand and a line guide movably attached to the stand by means of magnetic rollers rotatably mounted side by side with their flats in coplanar relation and their rolling surfaces aligned perpendicular to the line guide for rolling magnetic contact parallel with a side of the stand.

Abstract: A portable drafting device for drawing parallel lines, consisting of a rectangular flexible plastic material, two guides applied each on one of the short sides of the board, at least one slider adapted to slide on one of said guides, a rule fastened to at least one slider to slide therewith above said board for drawing parallel lines, said board being capable to be rolled into a roll for rendering it easily transportable.

Abstract: A light weight portable straight-edge which incorporates a complete 180.degree. protractor with a vise for individual position stability. The vise is essentially a common heavy gauge spring establishing a pivot that induces a constant pressure at the extremity of the opposing clamp and straight edge that together have a holding tolerance for materials of 1/4" to approximately 21/4".

Abstract: A microfilm reader includes a vertical rectangular projection screen surrounded by a rectangular frame. A cursor mechanism is separably provided which includes a vertical rail extending along a side edge of the screen between the frame top and bottom legs and slidably frictionally engaging a support member to which a cursor member is swingably mounted for angular adjustment in a plane parallel to the screen. The cursor member is releasably frictionally retained in its preset angular position and the support member is releasably frictionally retained in its preset vertical position. Cam means including a rotatable or slidable knob angularly adjusts the cursor member or the cursor member is directly turned by a knob attached to a pivot secured to the cursor member. The rail may be replaced by a side wall of the reader which is formed of magnetic material and the support member may carry a permanent magnet slidably securing it to the side wall.